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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae383df6de09a3a6db85d6d55e293e530e0248b6b95131f050e329e334711d08' 
  AND token = 'tRMLpoCT4n4EUPZCmEhJhvAalklFHnLQYQa6LnRrwfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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