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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb07333f357bce8a83f256342f6714be5e3cb3610aa9ca2371cadf40094d28b' 
  AND token = 'aDq72j+tyRzNzZIV+TcBRHtj38k08+izaSo64IEtxIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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