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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2eec3f21903999aa735edf29da41f13090a88b4c40cdd151ad80a04fa0f6c0' 
  AND token = 'N4GheGvytHz881k/upKdypGq7kz27FTo31OhWUFdNI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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