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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b71001b69b6d5babcafe0af18aeac19c8c00c1cfc2a76732f3e8e4afb845a28' 
  AND token = 'hbpWLU91I1HJps3Oqw2tIFN+XOd9/gISQUiwNWFbKsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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