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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983386caf2257f131481d2ef6073f86d64299aa5fb340d6a6329d4c2ab35f97f' 
  AND token = 'Krp8fRYc1bZa12whIVLyvccizhZTeXqx44I7lCdmxAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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