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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1903fbcaa7f206d99411fe13674ec32a5c2e22e3e82855093a23875b88b311db' 
  AND token = 'EQPDZ3RVR103jJTtUE2r2ZUd0QRKearwfHIHc7JAj/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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