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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5f5d5abd937cfcd75c853abca026b6859ffe35a6e21079d68fbb6436cfad98' 
  AND token = 'ZuFy2nOh/MZtloDMzyusDR6/WwaNlxRoFunmHFCZ5cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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