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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7ef3b5594164da121ec8387c83bc53426b05eed65ea9762ec770823f7e913b' 
  AND token = '7qHqtmFyqDyPGG6aBJk8ZKcFLZH980IxM2QgB4t9ctY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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