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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574140efb6fb26b2339fd69714d73efbc9f28ff5bbbea1e8f99b2adcf85e7586' 
  AND token = 'ozHWVIPULEk0hksBMpfRmrlH8+6l3uee/0CeqbHUVRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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