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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715e9ce858e5bcbd15b3c7954c15fb0bba9404f20201e4682b7bb80dea6e26a7' 
  AND token = 'gj6oJB0Vnt0oM5RgJEwO5WfCtaPEwrmFFfo89DyqzNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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