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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2844483c13170e28b61f1e9352604d3ab853c36e614deb2790ef6aa5c18d63a2' 
  AND token = 'oiFaf6M7rF7hl5GVa6CTDgTwYV7qVy1tgDwtX+XrydA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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