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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca32c0f1b8cdc0fb2c582bb4d7c2b35d806340262dc6b318553fe2d02ce514b' 
  AND token = 'jVK+3DwHDcEP1vovGTfoMqLWWw//rVN34l9C1F1rdZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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