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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c09a5c52afcee86c74c09a9f84d60083146e19bad887de14f0e59cb44b5277' 
  AND token = 'eH8wgtD0Bfvwjf4WS5xj051BX8g/Km94BELPDGRpseU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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