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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbc6b923413340d28ef4b6c77efb178903fc0d1ea5757d0e043817710e2f27f' 
  AND token = 'yqFc5mGc5HMW+Qq9I7NQSwR4JrV8kJVzIHSp0//kz44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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