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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3094c95ee5b8057dc2c90e82b27b929062826340d5c7366f587b0057508548ee' 
  AND token = 'uI4NPQN23EZt3WhsHxpTvRfA88trnd/TgEypnP2Tffk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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