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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f288455fdff2f71ca8da13dafa5909542e324d5a689daba7b1cb8b9bba3e44' 
  AND token = 'e3ECtMsrYCqG7WmsY9qUI3kKDEhUddMki+EJ98ZWEh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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