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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19e755cab904099e7937dff9602e67718ffe341b4d3f34660c997b78d6e8404' 
  AND token = '7NKhdw1JGHbsVJgwRuuOIlJyt8SUwepFDaO1Qsz5wC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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