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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79bb60ce107e63157718470ea13ee0ae01526d44fb8e4bee074c43a548d0d03' 
  AND token = 'W1jez15ylsYQuDB8CPEgYpPzk/GXH1UlKEbUMaF0IrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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