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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b91bf89b33728cb77c8f3a3ee5e3abfcb8bc705b12a19b24ab3fd77a9bc9d57' 
  AND token = '0hWWfewJldAMYNokAZ3OE9U+NBuihlkTzODt8c7f7AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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