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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9c958ba632f6338528debb8260fbcb4b198efb833f8cb3f719c4df317f7a90' 
  AND token = 'dLARyGloEJYGuz4Z49/uxp5ooJx/jPxhF5j1apTSN7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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