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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19dca501b37a9a1517d20c791f06ef802162efab35655cdd07ea3b941a6290bc' 
  AND token = 'Fklf4s/di5RQopVu/3lEOfmZW0hRn80Iws41dF5RM3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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