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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f40b0ba7c70192f1b440255c0dda022b4dbbb3e6f7e0418d8f0d04ad492a46e' 
  AND token = 'lm0Km+HhPk1hksKNx1hHRoEvPkkWB/tTcIFp/PGfFB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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