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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3915326a257a6b9ffeb3035bb59d57575eadde9ba1ddac6e844236a2dbf71a' 
  AND token = 'xtYVkABZbMBlzTdBrVDog5/X5CUX6uoAt91PPBKlDk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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