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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9b9059790ccfe953327d6d2e2ba93f02b9d5c24a31f52694906c76c6f8af1f' 
  AND token = '/38LJdbaQ/15X/71DCxNYps160dGgsrBP1XuoI0EMrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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