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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9f684b62e88b7765a79fa1783c8c0fd8906208910a61174f5ea14244ca19dd' 
  AND token = 'WTYvjtmeQxqlTnelgV1bGXsaxTIDfPOP+NQ8bbrm99E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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