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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddfa0c7087d8fb6ff7fcddd20a02e3da2ed08aa791278effad8fec7ebde7d32' 
  AND token = 'ovSWBT4u1yYNcvf7eKHRK3I54JFka3d6Q9hS8vXVA+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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