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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52885b5129fc4e1e4bd7ceae2dda18ffb124b3d316b03dcd450ea62bc2fcba3' 
  AND token = 'BJfCK4QO4xzGBsji7AawDT3yXqOWXxwv619WyVdas00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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