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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d082a0ec02e53d8d0b7360831c2141ad6d45f352c7a6063d2ca2cbc130990e6' 
  AND token = 'FhO05b/2i2cRuSznWqd2tN5GNFe7EX3KIh2XEbX3B/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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