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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b89e2fef7f6b71105a36c319bf31aaa4614f448a4394060f369b182e382caf1' 
  AND token = '7o/MTuT2XQEIneO849wtMERlfvsPAeVvBMEF+pqmLEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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