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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9347e24988cf43d4459a3e1e9e9ec54ced95c5ee9e3d723ff43bfeca97bdd2a' 
  AND token = 'JGhQjkKtWE0/f1hs0QMT11AgJGtsaldwrBzhnurJZx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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