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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3924d98bd46e7453199e8fb6544a7ddf4e39791dd81d7f493612f70ec42b9d15' 
  AND token = 'Yq3jrOy95VCMt0JmknkjOQS9EGErOOSYaMWq7P0DFyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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