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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b456b71a05e8d5b687f5aaf830601681dbf52c08bcf602a0e2305f9fcb4856b5' 
  AND token = '608h9V4eotcpGL+FkaRV/TfM7oMfGbXmB17S/nCyotQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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