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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e7ba70503f0cbe9f05dfec4d332800d6cfbaa5adec81be348de962fd116218' 
  AND token = 'NtFG84f+wj1zV0T+i8fFUMZYEkZYZ8HjDgWyRC13Qaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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