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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c383d6dfb1d3c7d9c3926a7bacb15814b5eb6ced76e00096432c2b44c03ce2' 
  AND token = 'qSzXm5dWKr3C69rLNQCM/Py7e8svWAiB0y5I0sU4MeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}