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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22f71aa8ca77a5d3579bad62c52dceb2ea45be1c3e8e4a7b8e55ff466f2c711b' 
  AND token = 'rRLh2geDKcTfevQ9p55iaIokXszroU38jtwUWb3nt0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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