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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea7c5429b53f44eb660e372dcf97bdd8b60a098172e0bf9ea6d37ccf79410a6' 
  AND token = 'iW5eEbgGUmr7DvMWZrpXx5nNrUlmBEtVgoQnfRBzTHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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