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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8922b21dd7426b8e5a83c6a46117e6db82597f5edfd63cd5ca69b88c908cfc' 
  AND token = 'VfMgOt2Jv8vLZQs/NlkOzJcCbUUCoIJP4C+y7iVQkW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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