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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc5c257700f1acc6e55adc8b96a3d2ea56839ab2a16c4561f72012bdbd69a6b' 
  AND token = 'eyZpFstqXxBixcirje8YZU35g9E/YieyeZ/FQDSSKNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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