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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62da3a3359998dbdb69141cb784c007a4f492b1347607be6dacc8acfb8d152c7' 
  AND token = 'ViQxIR76lMgmlX+BCRjH12mfzmzi7zgilza4f6z4aUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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