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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d8451c2eeef0856884a653c09b8f17a2ab2b0521994698135aa12412ca601e' 
  AND token = 'XM5ANICJwRKkdNS0Mdr3v5gU3+uIrWWsFQc6OnHavac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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