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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54790160c15e2ba4b0e3460d6af1852d23100d76d0b7e45c34c6182dd9a83e01' 
  AND token = 'L609jSMJ0Fgv1DScrgiUuCkeXR8wMH0NPg3wZEKbZVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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