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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1440ef4227cc16812dfa24428de0a370e3908be18dff3e8d6ab21af566045606' 
  AND token = '7OCeZf6H28A5B2AzYA87oarHEqPcDHhw5FTWBnCqqfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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