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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5af7da3d9add98002e40764a56f86692fdbc1e588cdf769c583e5ea8fa6f93f' 
  AND token = '9TGDaDRpMoYxhTlQ/i9vfMmuboHO6m35xhQk7aPGqOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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