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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07dc99f8a5749b7812c7fa62db57f6e54914017f35d1a9e9518cb2a83ba426c' 
  AND token = 'KqwqsoQdaJl/n6tCc7tYUdTeA5Qd1bCrGkdBIQW0OTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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