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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199f7fd603bceb69412c4a1629ef85cee0cbcfff480cedc65d9a4a2d2fbb9a78' 
  AND token = 'Wf5ioh9vaRO1Ml8/fJ0D+TrL+Q7V4FiVx/4G/sSmor0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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