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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef78d2360f84074e1842f94ab5cf1eedd3ebdec46bef66ade401805df7fbb5e6' 
  AND token = '104ouyJKDAQeYsnZLneHCLM6NwFBX8sNQbG2i9dB+HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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