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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023e9da294ecbe5792d1d0ce4b66b629fb29455d8704e6f09413612bc2e6b277' 
  AND token = 'EKkGN1nOFxxpa3dKKJVeUU3WphsdYLnHoKpBVlOAR60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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