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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb95777cc7d0bbba9d929e03bfc2d1039fabc739d98db96d2af8e7793242a8c1' 
  AND token = 'NIDcOsJE+zOLIjvMB6erwf84QW+3A0tV8tSuxG5ugNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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