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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1afcdc7f5a9530093b1f292b3c689895cf8abf4a3a7ac13b656fc7d8a962c8c' 
  AND token = '0v+XUZZWnCkiwKJ5W+sP3L4x5QxxWffPLVGKb+3m9lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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