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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3152753877ef6ce939f1faf2e15e4682950b469fbc370b822aece3be02cabc2f' 
  AND token = 'ngQabU9R6yxG2d5wV5H0x9b4DQwYdEpwgg4OnQ7JUh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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