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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94977064e7d946dc656c77d031316eb1200f29c3b64f44dfa2b59a8620ecbe8e' 
  AND token = 'JZwT7/a8cmGanGlFeGstPgPVu6nSoavNPydCRT6qO6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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