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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874fba3de5e19ac9bedfc000a60e1d29d10b552c361c56f827e8743200f76960' 
  AND token = 'dEloQWjL/4We1jiBqZ7xGltLkNRunnyQLjTD0laPv+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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