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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33cbeb4d7440bce839ab8cf6de8acbbe947ce34a93700c201d2646bcb63be5dd' 
  AND token = 'Pdm2ipki1xQr/jjewFFvqhgiambL1X2S/GYvg5p+jeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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