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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073201c27ebda7dd7ed90aa8a9a97fa969995402ee870aac456a396536c1e17f' 
  AND token = '3skP1LdAeZpzRZT9eg1e/W5Er98wmnrAKs7Iaw6nSus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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