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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eabb71e5ff129b1291c4496642d414f01875d6ad5eb5d939cefdf51f34e502a' 
  AND token = 'dK47j+Ij1u9xTZ2yJdZUmPM1WjyEvEhU2aVQiR6iD7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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