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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ab3185f375d83cb173e6d3b1afea8747536c96fcae8675ab5ef02dc6e3875c' 
  AND token = '5aWNZxF3nb57QVSJ+mxMbt5bosT+8Yo9gzxOl5QV7tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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