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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5d79583c87bb93018cbc4de85601dd855afb5d92593d629d9b10992ddfd8bc' 
  AND token = '4kSO8LYIXkR/LTdGhRLJ8ZKGOZkK0zM5CRkgEyji9YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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