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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec0c18a187b3d1580bc0f181b26cbacd1c479479510f23404b6b700c8bfb003' 
  AND token = 'XIPWhlHp7c3+QbEXJrykACzTVqsVRRFoCzrPcFHsxs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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