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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd527e422718a4e4de08ad6c43794f4301facd6b7073527b3fe3a942424af41b0' 
  AND token = 'Vj5PigDCbC5C+73XwrL/7chsj/itFJL3+pkAWsttNl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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