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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b32ad909269947c39cb6858c8472b97aeb6e1ea2fe2c88e6c16030d8f78b0a8' 
  AND token = 'SZRzgFb4ZArjjtDRBpmouiX8tALR/7ocyvM5ETFiVPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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