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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab76f31b00e4e8688447a94ebaf54b0eb1dbaed69583502a96812e33da719a4a' 
  AND token = '58yB7dsBYWEDsTliwR4sLh0MKnVn7tYIP4Xt8yrY8JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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