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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b32756b28f79625ed25df00fa70768a9d0f178bef01f236e05b40a61074976' 
  AND token = 't6K7HYmLiytcPIffw4Cg2lB/qVWPLg1XyDgl1k03AqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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