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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc59fcad6e0f3eea5e6311bcccecf7ea0f9df892938dc29f653dcf595b38d60' 
  AND token = 'nfUzg8Yml6TDj3pt8zFu8ifmDRHTbFxa6P1GWkYxUaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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