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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264df1dd123c7174720b17c66864f62d9c969fb2733ee055dfc5e857b2516909' 
  AND token = 'SqJipxe8FBJVnphHwri1nvkxWKjFJ5I9EreU3Z1p3J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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